Electrical vibration type compressor

Patent 4027211 Issued on May 31, 1977. Estimated Expiration Date:

May 31, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3469163

3575649

3671829

3676758

3729691

3781140

Inventors

Assignee

Sawafuji Electric Company, Ltd.

Application

No. 05/564135 filed on 04/01/1975

US Classes:

318/127, Automatic in response to predetermined position, movement or condition in or of the motor or driven device310/27, Fixed and movable wound elements318/130, Electrical oscillation or condenser charging and/or discharging circuits318/132, By space-discharge or unidirectionally conductive devices in energizing circuit417/417Unitary pump and motor working member

Examiners

Primary: Duggan, Donovan F.

International Class

H02K 33/18 (20060101)

Abstract

An electrical vibration type compressor comprising a drive coil vibratably supported in a mechanical vibration system, a piston driven by the drive coil, at least one main semiconductor element with a control electrode which performs the switching control of a drive current to the drive coil, and a detecting means consisting of at least one detecting semiconductor element with a control electrode detecting the vibration of the drive coil to control the conduction and cutoff of the main semiconductor element with a control electrode and at least one timeconstant circuit; whereby the feedback transformer which has so far been used in a device of this type to supply a feedback current to the main semiconductor element with a control electrode is eliminated, and the switching operation is properly performed at the top and bottom dead centers of the piston.